3 results about "Hafnium tetrachloride" patented technology

This invention relates to the field of hafnium carbide technology and discloses a thermal decomposition preparation process for hafnium carbide precursors. The process includes: dissolving hafnium tetrachloride in anhydrous ethanol, adding propylene oxide dropwise for neutralization and acid removal to obtain a neutral ethanol-hafnium precursor solution; adding ethyl acetoacetate methacrylate and heating for coordination to obtain a hafnium coordination monomer solution; adding acrylonitrile and an initiator and heating for polymerization; when the viscosity of the reaction solution increases, injecting a dimethyl sulfoxide hot solution of melamine as a locking liquid; precipitating, separating, and drying to obtain the hafnium carbide precursor; and after oxidative crosslinking treatment, calcining at high temperature under an inert atmosphere to undergo carbothermic reduction to obtain hafnium carbide powder. This invention achieves molecular-level dispersion of precursor components through liquid-phase coordination and in-situ network locking, effectively reducing the reaction temperature and inhibiting grain agglomeration, thus producing high-purity, ultrafine hafnium carbide powder.

This invention discloses a Ru@Zr x Hf y This invention relates to the field of electrocatalysts and its preparation method. The method includes weighing x mmol zirconium tetrachloride, y mmol hafnium tetrachloride, and 1 mmol terephthalic acid, dissolving them in 40–60 mL of DMF to form solution A; adding 3–5 mL of formic acid to solution A to form solution B and then sonicating the solution; subjecting solution B to a hydrothermal reaction to obtain product C; washing and centrifuging product C with a mixed solvent and then drying it under vacuum to obtain powder; dispersing 200 mg of the powder in 30–40 mL of methanol to form solution D; dispersing 0.1–0.3 mmol ruthenium trichloride powder in solution D and stirring to obtain solution E; washing and centrifuging solution E and then drying it under vacuum to obtain a precursor; heating the precursor to 700 °C and holding it for 2–3 h, then cooling it to 300 °C and allowing it to cool naturally to room temperature to obtain Ru@Zr. x Hf y O2 / C electrocatalyst. It solves the problems of high cost of Pt-based catalysts, easy agglomeration and structural damage of traditional Ru-based catalysts, and poor stability due to interference from corrosive ions in seawater electrolysis.

This invention relates to the field of dental implant technology, and in particular to a ceramic dental implant, its preparation method, and its application. The preparation method includes the following steps: mixing hafnium tetrachloride and zirconium tetrachloride in benzyl alcohol and reacting to obtain HZO piezoelectric ceramic powder; mixing the HZO piezoelectric ceramic powder with a sintering aid to obtain a mixture; using injection molding to prepare the implant body and abutment separately; sintering the implant body and abutment separately, and assembling them to obtain the ceramic dental implant. This invention, through synergistic optimization of material selection, structural design, interface connection, and surface modification, provides a ceramic dental implant with high safety, excellent mechanical properties, reliable interface connection, and piezoelectric activity, showing promising application prospects.